Studies of the breeding of sugar beets for resistance to curly top
Author AffiliationsKatherine Esau was Graduate Assistant in Botany.
Hilgardia 4(14):415-440. DOI:10.3733/hilg.v04n14p415. April 1930.
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The nature of the injury caused by curly top and the importance of this disease to the sugar-beet industry in certain western states have been recognized for many years and have been discussed by Ball,(2) Carsner and Stahl,(5) and Severin.(9), (10)
Studies of the behavior of beets affected with curly top have shown that individual beets vary as to their susceptibility to this disease. Reference is made here not only to observations of the writer but to those of Carsner and Stahl(5) and Carsner.(3) These observations have suggested the possibility of developing curly-top-resistant strains by selecting the least affected individuals among infected beets in commercial fields.
Carsner(3) has shown that resistance to curly top is an inherent characteristic in individual beets. Several of the strains which he selected for resistance to curly top were definitely more resistant than the commercial beets with which they were compared. Furthermore, he found that some other morphologically. uniform strains which were developed without reference to curly top showed constant differences in susceptibility to this disease.
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